Anthony Walgate, 23, Gabriel Kovari, 22, Daniel Whitworth, 21, and Jack Taylor, 25, died of an overdose of the party drug GHB and were found and around a graveyard near Port's flat in Barking, east London between June 2014 and September 2015.

Prosecutors claim Port dumped the bodies after meeting his victims on gay dating apps such as Grindr.

The Old Bailey today heard police found 83 home videos of Port having sex with various young men on his mobile phone.

Prosecutor Jonathan Rees QC said six of the clips '"on the face of it relate to the defendant having sex" the same man, who is said to have been raped by Port "when he is either asleep or unconscious".

Port, dressed in a pale blue shirt, dark blue tie and glasses, watched intently from the dock as they were played in court.

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A fourth man can be heard to say: "I'll leave you guys to carry on, I have got work in the morning," before leaving the room.

In the clip Port is heard to say: "Shall we do more stuff?"

His friend replies: "Yeah babe."

The alleged serial killer is charged with two sample counts of rape based on two of the videos.

He is said to have committed a string of sex offences against 12 men over three-and-a-half years, between 2012 and 2015.

Port allegedly murdered Anthony Walgate, 23, in June 2014 and was jailed in March 2015 for perverting the course of justice after lying to the police about the death.

But by the time he was convicted he had gone on to kill two other men, it is claimed.

Slovakian Gabriel Kovari, 22, and 21-year-old chef Daniel Whitworth, from Gravesend, in Kent, were allegedly murdered within weeks of each other in August and September 2014.

6

A dog walker previously told the court how she found the body of Gabriel Kovari in a nearby churchyardCredit: News Group Newspapers Ltd

Both, like Mr Walgate, had died of GHB poisoning and were found in an almost identical position in St Margaret's churchyard, in Abbey Green.

Port is said to have killed again just three months after being released from prison, in September 2015, when forklift truck driver Jack Taylor, 25, was found near the same churchyard.

Port, formerly of Cooke Street, Barking, east London, denies four counts of murder, four counts of manslaughter, four counts of administering a poison with intent to endanger life or inflict grievous bodily harm, seven counts of rape, six counts of administering a substance with intent to overpower to allow sexual activity, and four counts of sexual assault by penetration.

The trial continues on Monday.

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